<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form id="upload-form" action="http://localhost:9000/problem/upload" method="post" enctype="multipart/form-data" >
    　　　<input type="file" id="upload" name="file" /> <br />
<!--            <input type="file" id="uploads" name="files" /> <br />-->
    　　　<input type="submit" value="Upload" />
</form>
</body>
</html>